Number work dial



May 10, 1932. K; HAMMOND NUMBER WORK DIAL Fi'led Nov. 7, 1930 I Patented May 10, 1932 EMMETT KY LE HAMMOND, OF NEWPORT NEWS, VIRGINIA NUMBER WORK DI Application filed. N

' to an nvention has reference l d eirice and is in the nature of a to enable the pupils in H learn th nar Y and elementa y g1 atlas t9 in u; $21 1 1- -Fn n iifll a J't'li tifi ni fig fift li liands around the dial figures attract the attention of the pupil, arouses his interest and permits him to concentrate his mind on the problem.

To the attainment of the foregoing the invention consists in the improvement hereinafter described and definitely claimed.

In the drawings:

Figure 1 is a face View of the improvement.

Figure 2 is a sectional View approximately on the line 2-2 of Figure 1.

Figure 8 is a detail elevation to illustrate 2 the squared ends of the knobs to which the hands are attached.

The improvement may be constructed of any desired material and comprises a face plate 1, and the same is provided with consecutive figures numbering from 1 to 12. Thus the face plate is in the nature of a dial of a clock. The dial 1, adjacent to the top corners thereof, is provided with openings for the passage of the knotted ends of a cord 2 whereby the dial may be suspended from a suitable support.

The dial plate 1, at the center thereof, is provided with a round opening 3 and through this opening there is passed the rounded barrel portion 4 of a knob 5. The

barrel 4 has on its outer face a squared extension 6 to be received through the squared opening of a hand 7. Passing through the rounded bore of the knob 5 there is the round 9 spindle 8 of an inner knob 9. The outer end of the spindle 8 projects a suitable distance beyond the end of the barrel or spindle 4 and is also squared in plan, as indicated by the numeral 19. The said squared portion 19 is designed to be received through a square opening in a second hand 10. A washer 11 holds the hands from contact with the dial face, and preferably the spindle 8 is formed with a threaded extension on which is screwed a nut 12 that contacts with the hand 10.

My pres educationa dial so devised as ovember 7, 1930. Serial No. 494,110. I V I I H ts the hour hand of the h d7 re resen I clo l r an d the hzihd 10 represents the mmut: hand of the clock. Obviously by turnin ta 1' and in this manner the pupil will readily learn to tell the time of the day. By bringing the hands together and turning both of the knobs in unison and at the same speed the pupil can learn to count from 1 to 12. By otherwise manipulating the knobs the pupil can learn the subtraction and addition of small numbers, that is, numbers from 1 to 12.

The numerals are painted a light green or like color which is restful to the eyes and the back plate is of light wood or metal and may be painted a darker green. The cord instead of being attached to a fixed support is primarily designed to be arranged around the Y? neck of the teacher so that his or her hands are free to operate the knobs that control both of the hands. As a further example with respect to the teaching of addition or subtraction we will first suppose that the teacher is instructing the class in addition. She gives orders to always add the two numbers to which the hands point or in subtraction to subtract the small from the larger number. It will be apparent that a large number of combinations in both addition and subtraction may be thus taught the pupil. In teaching the time of day the teacher may manipulate the hands to bring the same opposite the numbers to indicate the proper time suggested by the teacher or the pupil may be allowed to turn the hands opposite the proper numerals on the dial.

It will be noted from the above that the device is designed for use in both primary and elementary grades and by its use accomplishes the following desired results:

1. Teach pupils to tell the time of day.

2. It may be used as a novel race track in number work in different ways and greatly. interests the child and develops accuracy and speed.

Having described the invention, I claim:

An educational device for pupils of primary and elementary grades, comprising flat plate having circularly arranged figures thereon numbering from one to twelve, a supporting board for the dial plate, said plate having a central round opening therethrough, 6 a knob having a barrel extending through said opening, and having its outer face squared, a hand having a squared opening received over the squared end of the barrel, a washer surroundin the barrel and arranged against 10 the outer Face of the plate, a second knob having a spindle extending through the barrel and having a squared end formed with a threaded extension, a second hand having a squared opening to be received on the squared end of the spindle and a nut screwed on the extension of the spindle and contacting with the outer face of the said hand.

In testimony whereof I affix my signature.

Ell, 'FIMOND. 

